Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2005-11-29
2005-11-29
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C356S613000, C356S388000, C382S131000, C250S559360
Reexamination Certificate
active
06969836
ABSTRACT:
A method of determining the leading edge (E) of a turbine blade or airfoil (P). The object is mounted in a desired position and backlit using a light source (S). The object and its leading edge are viewed using one or more cameras (I) which are positioned on the opposite side of the part. When illuminated, the object blocks a portion of the light from the source and the occluded portion of the light defines an outline (T) of the object including its leading edge. An image of the object is obtained and the part is then moved to other positions at which additional images are obtained. The images are processed using a space carving algorithm to ascertain the contour of the leading edge of the object. This allows accurate measurements of the leading edge to be made for using in determining acceptability of the part.
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patent: 4877940 (1989-10-01), Bangs et al.
patent: 5864640 (1999-01-01), Miramonti et al.
patent: 2002/0145103 (2002-10-01), Bernardini et al.
Andrew W. Fitzgibbon, G. Cross and A. Zisserman. “Automatic 3D Model Construction For Turn-Table Sequences”, in L. Van Gool and R. Koch, editors, Structure and Motion from Multiple Images in Large-Scale Environments, lecture notes in Computer Science, Spring 1998.
Kutulakos, K. N., et al., “A Theory of Shape by Space Carving”, Computer Vision, 1999. The Proceedings of The Seventh IEEE International Conference of Kerkyra, Greece Sep. 20-27, 1999, Los Alamitos, CA, USA, IEEE Comput. Soc, US Sep. 20, 1999 pp 307-314
Search Report.
Cross Geoffrey Mark
Tu Peter Henry
Allen Stephone B.
General Electric Company
Patnode Patrick K.
Testa Jean K.
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